TUSB320LAI: Best part to use?

Hi Dan,

If you are looking to use 10W, are you looking for specifically a 5V/2A detection from the TUSB320LAI, or are you looking for the 5V/3A detection?

The TUSB320LAI supports 5V/900mA, 5V/1.5A, and 5V/3A power detection over a type-c connection. If you are looking for specifically 5V/2A, you will need to use a PD controller to set that specific voltage/current.

Thanks,

Ryan

5V/3A capability should be more than enough power (but the spec is in flux). My other concern is that there is enough power to bring up the system when 1st plugged into the USB Type-C up stream device supplying the power.

Hi Dan,

The CC/PD controller on the DFP side of the connection will advertise the power it can provide over the CC lines. After detecting what the advertised power is by the DFP, the TUSB320 will communicate through to the device through the OUT1/OUT2 pins, or through I2C, what the detected power is, and then the device can pull the power needed based on the advertised power.

Using the OUT1/OUT2 pins, or register 0x08 for I2C mode, you can determine whether the connected DFP provides enough power or not, and control your system accordingly.

Would that help for determining whether the connected DFP provides enough power or not?

Thanks,

Ryan

Hi Ryan, For our application the USB supplies power to the device so initially USB power (VBUS?) needs to power the TUSB320 . Then after detecting what is advertised from the DFP, if 5V/3A is available then the main processor/system can be powered up. This would have to be controlled by the OUT1/OUT2 pins (going to some logic). Does this seem doable?

Hi Dan,

So you would have VBUS supply power to the TUSB320 but not the system until the OUT pins indicate a 5V/3A DFP has been connected, correct? As long as the controller is being powered by VBUS, it should work, yes.

Thanks,

Ryan